WhenToBird

Agelaius phoeniceus · Icteridae

When Do Red-winged Blackbirds Arrive in Missouri?

Adult male Red-winged Blackbird
Photo: infiniteuniverse, CC0 1.0 via iNaturalist

Red-winged Blackbirds are in Missouri all year, but most are here in spring: numbers build from early March, peak in mid April (39% of checklists), and fall back by late July. In the quietest week (the second week of September) they are still on about 6.0% of checklists.

When to look

Numbers buildMar 1-7early March
PeakApr 15-21mid April
Fall back byJul 22-31late July
FewestSep 8-14the second week of September

Best: mid April. Here all year; numbers build from early March and fall back by late July. Peak: on about 39% of Missouri checklists.

  1. Januncommon
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepuncommon
  10. Octcommon
  11. Novcommon
  12. Decuncommon

Darker months: more checklists report it. Outlined: peak month.

0%20%40%60%Jan 1-7: 9.0% of 12628 checklistsJan 8-14: 9.3% of 9076 checklistsJan 15-21: 9.6% of 8790 checklistsJan 22-31: 9.2% of 11986 checklistsFeb 1-7: 12% of 8987 checklistsFeb 8-14: 12% of 10394 checklistsFeb 15-21: 15% of 15472 checklistsFeb 22-28: 25% of 9917 checklistsMar 1-7: 30% of 9877 checklistsMar 8-14: 34% of 9570 checklistsMar 15-21: 35% of 10274 checklistsMar 22-31: 36% of 16156 checklistsApr 1-7: 38% of 12774 checklistsApr 8-14: 38% of 14048 checklistsApr 15-21: 40% of 14894 checklistsApr 22-30: 39% of 23288 checklistsMay 1-7: 36% of 22645 checklistsMay 8-14: 36% of 21384 checklistsMay 15-21: 36% of 13989 checklistsMay 22-31: 37% of 15784 checklistsJun 1-7: 35% of 9691 checklistsJun 8-14: 34% of 9036 checklistsJun 15-21: 33% of 7907 checklistsJun 22-30: 32% of 9831 checklistsJul 1-7: 33% of 8008 checklistsJul 8-14: 30% of 7202 checklistsJul 15-21: 28% of 7151 checklistsJul 22-31: 23% of 9833 checklistsAug 1-7: 18% of 7639 checklistsAug 8-14: 15% of 7507 checklistsAug 15-21: 11% of 7429 checklistsAug 22-31: 8.3% of 11182 checklistsSep 1-7: 6.1% of 9471 checklistsSep 8-14: 5.8% of 8501 checklistsSep 15-21: 5.9% of 8169 checklistsSep 22-30: 8.7% of 11572 checklistsOct 1-7: 13% of 9028 checklistsOct 8-14: 17% of 9413 checklistsOct 15-21: 17% of 8656 checklistsOct 22-31: 18% of 11625 checklistsNov 1-7: 20% of 8627 checklistsNov 8-14: 17% of 8284 checklistsNov 15-21: 15% of 8075 checklistsNov 22-30: 13% of 10430 checklistsDec 1-7: 11% of 7870 checklistsDec 8-14: 10% of 7567 checklistsDec 15-21: 11% of 9696 checklistsDec 22-31: 9.0% of 13142 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in Missouri that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

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Where in Missouri

Best counties

Share of checklists at the peak
  1. Moniteau CountyBest early June · 21 checklists that week, 614 in all89%
  2. Nodaway CountyBest the second week of May · 18 checklists that week, 834 in all83%
  3. Harrison CountyBest mid April · 11 checklists that week, 715 in all83%
  4. Knox CountyBest mid March · 12 checklists that week, 215 in all82%
  5. Chariton CountyBest late May · 10 checklists that week, 586 in all82%
  6. Carroll CountyBest the second week of June · 12 checklists that week, 770 in all81%

Best spots

Share of checklists at the peak
  1. Univ of Mo (South Farm R-1 Lake)Boone County, best mid May · 31 checklists that week, 2,217 in all99%
  2. Leach (B.K.) Memorial Conservation Area (north)Lincoln County, best the second week of May · 21 checklists that week, 281 in all98%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In Missouri, the Red-winged Blackbird is most often listed on checklists started between 6 and 8 am (27% of those checklists).

0%10%20%30%12 am: too few checklists (205) to judge1 am: too few checklists (179) to judge2 am: too few checklists (204) to judge3 am: too few checklists (216) to judge4 am: too few checklists (630) to judge5 am: too few checklists (5072) to judge6 am: 30% of 27231 checklists7 am: 25% of 64162 checklists8 am: 25% of 67854 checklists9 am: 26% of 56515 checklists10 am: 23% of 47496 checklists11 am: 20% of 38845 checklists12 pm: 19% of 33383 checklists1 pm: 19% of 32503 checklists2 pm: 20% of 32615 checklists3 pm: 21% of 32514 checklists4 pm: 23% of 30274 checklists5 pm: 27% of 23446 checklists6 pm: 26% of 16374 checklists7 pm: too few checklists (10236) to judge8 pm: too few checklists (3133) to judge9 pm: too few checklists (722) to judge10 pm: too few checklists (405) to judge11 pm: too few checklists (261) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January9.0%9.3%9.6%9.2%
February12%12%15%25%
March30%34%35%36%
April38%38%40%39%
May36%36%36%37%
June35%34%33%32%
July33%30%28%23%
August18%15%11%8.3%
September6.1%5.8%5.9%8.7%
October13%17%17%18%
November20%17%15%13%
December11%10%11%9.0%

Neighboring states

  • Arkansas: arrives mid February, 2 weeks earlier than Missouri
  • Iowa: arrives mid February, 2 weeks earlier than Missouri
  • Kansas: arrives early March, in the same week than Missouri
  • Illinois: arrives late February, 1 week earlier than Missouri

Common questions

When do Red-winged Blackbirds arrive in Missouri?
Red-winged Blackbirds are in Missouri all year, but most are here in spring: numbers build from early March, peak in mid April (39% of checklists), and fall back by late July. In the quietest week (the second week of September) they are still on about 6.0% of checklists.
When do Red-winged Blackbirds leave Missouri?
Red-winged Blackbirds never fully leave Missouri: numbers fall back below half their usual rate by late July, but some are still reported in every week, about 6.0% of checklists at the low.
When is the best time to see a Red-winged Blackbird in Missouri?
The Red-winged Blackbird is reported most often in mid April, on about 39% of Missouri checklists.
Where in Missouri are Red-winged Blackbirds seen most often?
By county, Moniteau County, Nodaway County, and Harrison County have the highest peak reporting rates for the Red-winged Blackbird (counties with at least 200 checklists).